Paper 5 Tips !! :)

[minhaj89]

Can any one plz help me with this 2nd q of w12 53 http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_w12_qp_53.pdf

 

[anishniroula]

Alright, underline your kewords as you read the question.. tell me what you're gonna label your columns..i'll guide you inshAllah.

i labelled my coloums as

mass of water/gm (C-B)
mass of solid/gm (E-D)
and i calculated solubilty by diving (E-D)/(C-B) i.e F/E.
Did i did correct? Thank you.

 

[knowitall10]

Can any one plz help me with this 2nd q of w12 53 http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w12_qp_53.pdf

with which part?

 

[knowitall10]

i labelled my coloums as

mass of water/gm (C-B)
mass of solid/gm (E-D)
and i calculated solubilty by diving (E-D)/(C-B) i.e F/E.
Did i did correct? Thank you.

Yea, you calculated the mass of the solid and that of water correct. But the solubility would be grams of solid/ 100g of water.

 

[anishniroula]

Yea, you calculated the mass of the solid and that of water correct. But the solubility would be grams of solid/ 100g of water.

yeah! for example i calculated the mass of solid 2.0 gm, so wouldn't my solubility would be mass of solid( 2gm)/mass of water(which i calculated using C-B) or it would be mass of solid/100

 

[knowitall10]

yeah! for example i calculated the mass of solid 2.0 gm, so wouldn't my solubility would be mass of solid( 2gm)/mass of water(which i calculated using C-B) or it would be mass of solid/100

mass of solid/ 100g

 

[minhaj89]

has any one completed w12 53 http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_w12_qp_53.pdf

 

[sagystu]

h
here u go

i really really appreciate , posting the pic but that wasn't the one i wanted i wanted s11:51: 2c

 

[minhaj89]

with which part?

b part

 

[queen of the legend]

In o/n 2008 paper ...question 1 :

the solubility is given as mass of solid/ mass of water x 100 ............does that mean mass of solid crystallised or undissolved??

 

[anishniroula]

mass of solid/ 100g

but you said solubility is mass of solid/mass of water *100

 

[knowitall10]

but you said solubility is mass of solid/mass of water *100

yea i did... that's what i was told btw...shoot... I'm sorry...now i'm confused

 

[anishniroula]

It is the mass of the solid which dissolved.

bro please help me to calculate solubility of q no 2 of May/june 2011.
may all of you get A's and A*

 

[knowitall10]

bro please help me to calculate solubility of q no 2 of May/june 2011.
may all of you get A's and A*

yes..please do...

 

[queen of the legend]

yes..please do...

which variant ?

 

[sagystu]

yes..please do...

whic variant ?

 

[knowitall10]

which variant ?

v3 i think...it's l8..i'm actually very sleepy..spent my life's energy on p5 the whole day

 

[knowitall10]

pearl angel we're discussing ur question here

 

[queen of the legend]

v3 i think...it's l8..i'm actually very sleepy..spent my life's energy on p5 the whole day

v.53 is about moles ratio ....very easy ...........calculate mass of lead (C-A) ....then mass of oxygen(C-B) ....the other columns ...get the no. of moles by diving each mass by Ar of the element ....plot a graph of moles of lead against moles of oxygen ,...the slope give u a ratio hence the formula of the compound

 

[knowitall10]

Oh! Ashique i understand what u meant by the heat now! right right..thx!